The Norseman that is killed on the beach has padding that appears under his outer garment when he is shot with arrows, when that padding was clearly not present just prior to being shot.
The Norse did not wear helmets with horns on them.
Vikings used longbows, not crossbows.
The Norseman killed on the beach went down as if mortally wounded with only two arrows in his hip, and one that he pulled from his own shoulder. He also had blood coming from his mouth. Yet he had received no arrows to any vital part of his body or torso. And he never fought back or charged the Native Americans.
Oil tanker seen sailing in the background of one scene.
On one of the shipboard scenes, one of the Vikings is wearing a wristwatch.
When the native Americans attack the Norseman on the beach, they are shooting modern target practice arrows with round pointed metal tips.
The metal breastplates worn by some of the Norse men were not invented until at least two hundred years after the setting of the movie.
When the Norseman on the beach receives two arrows in the left hip, the padding is visible under his outer garment area where the arrows stick. The padding is also attached to his outer garment and not his body, as the arrows move with his garments and not his body.
When the Norseman on the beach receives an arrow in the left shoulder, the padding is visible under his outer garment area where the arrow sticks.
The round grindstone wheel used by the enslaved Vikings to grind corn in their cave prison is obviously a metal frame covered with hide and made to look like a stone wheel.
The setting is supposed to be the Canadian coastline. However, the beach scenes were shot at Green Key Beach, in New Port Richey, Pasco County Florida, complete with varieties of palmetto scrub in several scenes.